Showing posts with label History. Show all posts
Showing posts with label History. Show all posts

Friday, July 15, 2011

The History of Glass Making and Blowing - Part 1


The Beginning of glass making

Glass has been used for a very long time, even in the Stone Age. At the time, people found glass by accident. Glass is formed naturally when rocks melt in high temperature; two main forms of natural glass occur when lightning strikes sand, or when volcanic eruptions happen and then the area cools down and solidifies rapidly. So unless such natural events had happened, people could not find glass.

Natural glass is green or bluish green in color because of iron impurities in the sand. Colored glass can be made by adding metals and mineral oxides, but such skills have developed only later in the history of civilization.

While it is not known exactly when people first began to make glass themselves, ornamental glass in forms of beads, seals, and decorations have been found from around 2500BC and glass making was first recorded in ancient Rome, Egypt, and Syria. Glass was used to produce glazes on pots and vases. After 1500 BC, Egyptians began to produce glass pots and vases. Glass was rare and hard to make; thus, it was considered to be as valuable as jewels, and only the ruling classes could afford them.

Syrian Glassblowing: the Beginning of Free-blowing

Between 27 BC and AD 14, Syrian craftsmen began the art of glassblowing. Long thin metal tubes were used for the blowing process and this technique has remained almost unchanged since then. The function of these blowpipes was to make glass production much easier, faster, and cheaper. With this tool, air is puffed into a molten portion of glass at the end of the blowpipe to make the glass into a desired shape. It is also a widely used method for glass-forming these days.

Easier production of glass led to widespread use by the common people. During this period, glass makers also learned how to make transparent glass and how to decorate glass, so indeed this was a time of growth and prosperity for the glass making tradition.

Roman Influence in Glass Making

Romans spread glass making techniques through their conquests and trades. Glass works were found in Italy, France, Germany, Switzerland, and as far as China thanks to their influences.

At first, Romans used glass mainly for thick-walled vessels. Their method of glass making focused originally on cast glass. The vast majority of manufacturing techniques was still time-consuming, and glass remained expensive and a symbol of luxury.

However, during the Pax Romana after the civil war, glass making flourished in the stable political environment. Gradually glass makers produced vessels with thinner walls, and the process also became quicker. Soon, glassblowing became more common instead of molding. In the process, glass became a commonly available material and a wider variety of people began to use it. The first glass mosaics appeared and glass windows were also used under the Roman reign for the first time.

The expansion of the empire vastly expanded the market, and raw glass was produced by heating and fusing silica and soda. Romans are even said to have recycled glass. glass making capitals such as Alexandria and Koln emerged, which became the center of Roman glass making development.

The history of glass goes on in part 2.




Find out more about exquisite hand blown glass vases, bowls, paperweights. The products are owned by the nation's leading museums, such as the Metropolitan Museum of Art, the Smithsonian Institution, the Corning Museum and the Chrysler Museum of Art. Each piece is signed, dated, and registered to verify its authenticity, protecting its value for the future.



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Wednesday, July 13, 2011

The Fascinating 5000-Year History of Glass


Glass making goes back a long time - all the way to 5000 B.C. Written records of Pliney, an ancient Roman historian, state that the Phoenician merchants inhabiting the region of Syria were the first to accidentally stumble upon a new and useful substance called 'glass'. However, many myths and legends shroud the actual discovery of glass.

Glass making in Egyptian times

The exquisite, and almost ethereal, shapes that glass makers create today have evolved over the centuries. By 3500 B.C., glass beads had started adorning the upper-echelons of Egyptian society. Glass beads and amulets, dating back to pre-Roman eras have been said to be worn as far back as 2500 B.C. During the pre-Roman times, glass vessels were being made but the art of glass blowing had not yet been invented. The Egyptians and those in the Middle East were mostly making glass mosaics.

Romans discover glass blowing

It was not until the 1st century BC that glass blowing, as it is known today, actually made an appearance in Syria (then under the Romans). This powerful discovery completely transformed the way glass would henceforth be used and, finally, appear. The tedious task of wrapping glass around a core to turn it into a vessel now became so much easier with the new glass blowing technique. Suddenly, a whole vista of endless possibilities opened up before Roman glass artisans.

In a short time, Rome began to dominate the glass market, as it did in many other trades. Rome soon became the ancient world's epicentre for production and distribution of blown glass.

Glass works during the Middle Ages

During the Middle Ages, glass was primarily made as coloured ornamentation for use in stained glass windows in the Gothic architecture that dominated most of Europe at that time.

From Venice to Murano

It was in this exciting period of change and discovery that glass blowing began to be concentrated in Venice, which had no less than 8,000 glass artisans during the Middle Ages! The Italians, however, guarded their glass blowing secrets zealously, going so far as to even lay down a stern decree that made sharing or 'leaking' out glass-blowing techniques to outsiders as a punishable offence!

Glass-making involved the extensive use of fire, which always a posed a risk to the crowded and timber-rich city of Venice. And, so in 1291, glass-making officially moved out of Venice to the then little-know and remote island of Murano. These Murano blowers soon became the last word in the delicate and time-consuming art of glass blowing, creating exquisite shapes and designs that would enthrall coming generations. But, at the cost if their freedom. No artisan or his family was allowed to leave the shores of Murano -- it was an offence punishable by death.

Murano artisans escape to Europe

Still, many artisan makers did manage to escape Murano and it was they who spread the art of glass blowing outside Venice and introduced it to Tyrol, Vienna, Flanders, France and England. The earliest Venetian glass was used for making rosaries as evidenced by some 13th century rosary beads that have been since discovered. These talented Murano artisans also made a spectacular contribution to the way mirrors were made. Polished metal mirrors began to give way to lovely glazed mirrors (women were delighted!)

Glass blowing in China

There is not much known about glass being made in China -- even while it was being moulded into fantastic shapes and decorative pieces in far away Rome. The earliest records of glass in China date to 221 B.C. - 220 A.D. It is believed that blown glass was introduced to China by Persian artists. Historians now attribute the limited interest in the substance generally in ancient China to the incredible and widespread use of paper technology. For example, in China windows were 'glazed' with strong, translucent paper panes. They simply did not see the need for 'glass'!




D Mukherjee is a former journalist who contributes to numerous UK websites, including one on decorated wine glasses where you can see modern artistry in glassware. If you want to buy contemporary hand-decorated cocktail glasses, visit: http://www.pressies4princesses.co.uk/Novelty-Glasses1.shtml.



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Tuesday, July 12, 2011

The History of Glass


Natural glass is formed when certain types of rocks are subject to high heat followed by a rapid cooling. Events such as volcanic eruptions, meteorites, and lightning could help in the forming of glass. The history of glass begins with the beginning of time. Experts believe that cutting tools made from natural glass were used during the Stone Age. They used a volcanic glass known as hyalopsite or a glass known as tektikes which was formed by meteorites or other means. Glass has a long history and the uses and processes to make it have evolved over time.

The history of man made glass dates back to approximately to 3500 BC. Egyptians and inhabitants of Eastern Mesopotamia were making glass beads that were not transparent. Also around this time in history, people in Central Mesopotamia were using raw materials of glass to make glazes for their pots and other vessels.

Pieces of glass vases have been found in Mesopotamia that date back to 1600 BC. This begins the history of glass being made in hollow production. It is believed that around this time, hollow glass production had also begun in China and Greece.

Egyptians began making glass pots by dipping a core mold of sand into hot glass. They would turn the mold so the glass would stick to it. While it was still hot, they would roll it on a stone slab to smooth it. This process started about 1500 BC.

Syrian craftsmen discovered the craft of glass blowing between 27 BC and 14 AD. In the history of glass, this was a major change. It increased the variety of shapes and containers that could be made with glass. They used a metal tube that was long and thin. This process is still used by glass blowers today.

The discovery of clear glass occurred abut 100 AD. Romans start putting glass windows in prestigious buildings and villas. At this time, Roman glass was being exported all across Europe and the Mediterranean. Roman glass has even been discovered in China.

In the 11th century, a method for producing sheet glass was discovered by a German craftsman. It would produce flat pieces that were small in diameter. The glass pieces were put together with lead. In the history of glass, this was the beginning of stained glass.

Pure crystal appeared in the latter part of the 15th century when craftsman started using quartz and potash in the production of glass. The history of glass progressed when an English glassmaker named George Ravenscroft patented his new glass in 1674. He developed lead crystal by using lead oxide in place of potash. Lead crystal was easier to cut and engrave in addition to being brilliant.

Towards the end of the Industrial Revolution, technology for mass production of glass came into play. Freidrich Siemens invented the tank furnace. The tank furnace was a replacement for the pot furnace. It allowed large amounts of molten glass to be continuously produced. Another invention was the automatic bottle blowing machine that was invented by Michael Owens at the end of the 19th century. In 1923, a gob feeder was developed. It supplied more uniform sized gobs at a quicker pace for bottle production. In 1925, an IS (individual section) machine was being used with the gob feeder. This allowed numerous production of bottles from one machine. This idea is still used on systems today.

In 1914, a man from Belgium named Fourcault, discovered a way to draw a continuous sheet of glass from a tank. In 1917, an American named Colburn discovered another way to draw sheet glass. This process was picked up by the Libbey Owens' company. There was also the Pittsburgh process that has been used since 1928 that made the Fourcault and Colburn systems better. It is still used today.

The history of glass has early beginnings and with the use of computers, the production is even quicker and more accurate today. Now being used in solar panels, uses for glass are probably still waiting to be discovered.




Steve Weber is a home hobbyist who works with glass, metal, and clay. On his website he offers more info about glass history



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Saturday, July 9, 2011

Roman Glass Jewelry - Wear History Art and Color in Your Jewelery Necklaces, Earrings, Bracelets


Roman Glass is an ancient glass, discovered in archaeological excavation sites in Israel and in other Mediterranean countries.The fine Sterling Silver Roman Glass Jewelry is one of the most popular types and styles originated from Israel enabling to wear an entirely unique piece of 2,000-year-old history. The glass in this aqua-hued jewelry began life as a vase, jug, or vessel. Uncovered from ancient Roman archaeological sites in modern-day Israel, each fragment has been textured and colored by centuries of wind and weather. Each bear the marks of not only its past life as a household or temple object but also the very earth in which it rested until being transformed into a unique accent. Each piece of Roman glass is framed by a sterling silver bezel.

The designs for the jewels are based on artifacts and drawings also discovered on the archeological digs. The Roman Glass is a beautiful piece of history dating back 2,000 years to the time of the Roman Empire. The Roman Glass used for jewelry today in Israel is found in archeological digs throughout the land of Israel. The natural phenomenon which the glass has undergone over the many years it has been buried have given it the unique and beautiful aqua shades we enjoy today.Initially, in the Roman empire, glass was mainly used for vessels and available only for the wealthy. At that time, glass was manufactured by core forming, casting, cutting and grinding. However, since the invention of the glass blowing, glass was available to the public in vast numbers, mass produced in a large variety of shapes and forms. Due to the great popularity of glass during those ancient times, we today are privileged to make use of these gorgeous historical pieces with which we enhance the beauty of our jewelry. Ancient Israel, due to its large stretches of sandy dunes and beaches, was one of the largest glass producers of the Roman Empire. These same sands helped preserve the glass through the centuries, shaping and tempering it into the jewelry-quality pieces being excavated today. Today the fragments of the 2000 years old Roman Glass that were once part of the lip of a goblet, jar, or other vessel are used in Israel to create beautiful jewelry that mixes the typical blue and green old glass excavated from archaeological digs with silver or gold creating a piece of art and history to wear with love.

A certificate of authenticity is available for the Roman Glass jewelry.

It is interesting to know some facts about the glass history and the Roman Glass history, collected from several sources.

The History of Glass

Glass is formed when sand (silica), soda (alkali), and lime are fused at high temperatures. The color of the glass can be altered by adjusting the atmosphere in the furnace and by adding specific metal oxides to the glass "batch" (such as cobalt for dark blue, tin for opaque white, antimony and manganese for colorless glass). A venerable legend perpetuated as late as the seventh century A.D. in the writings of Isidore of Seville gives a suitable miraculous explanation for the discovery of this elemental--yet truly wondrous--material - This was its origin: in a part of Syria which is called Phoenicia, there is a swamp close to Judaea, around the base of Mt. Carmel, from which the Bellus River arises . . . whose sands are purified from contamination by the torrent's flow. The story is that here a ship of natron [sodium carbonate] merchants had been shipwrecked; when they were scattered about on the shore preparing food and no stones were at hand for propping up their pots, they brought lumps of natron from the ship. The sand of the shore became mixed with the burning natron and translucent streams of a new liquid flowed forth: and this was the origin of glass.(Isidore of Seville, Etymologies XVI.16. Translation by Charles Witke.) It is not surprising that the ancient authorities thought of Phoenicia as the birthplace of glass, for the Syro-Palestine region did indeed become a major center of glass production in antiquity, along with Egypt. However, glass seems actually to have been "discovered" not in Phoenicia, but in Mesopotamia. Archaeological research now places the first evidence of true glass there at around 2500 B.C. At first it was used for beads, seals, and architectural decoration.

Some 1,000 years elapsed before glass vessels are known to have been produced. Vessels of glass quickly became widespread in the second half of the second millennium B.C. They were popular not only in Mesopotamia but also in Egypt and the Aegean. The earliest vessels were core-formed. Opaque, dark glass in its molten state was wound around a clay core attached to a metal rod. The skin of hot glass was fashioned with tools in order to shape its external features. Lighter colored strands of hot glass were then trailed on the surface and often "dragged" to produce festoon patterns. The pot surface was marvered (that is, rolled on a smooth, flat surface to produce a level finish). Finally, it was cooled slowly before the clay core was scraped out of the hardened vessel. This glassware typically imitated forms originally established for ceramic, metal, and stone vessels . Somewhat later, the molding technique was developed, whereby glass chips or molten glass were packed or forced into a mold and then fused. After a molded vessel was annealed (cooled slowly in a special chamber of the glass furnace), it was often ground and polished in order to refine the rim and any other rough edges. One typical shape for molded vessels of the late Hellenistic and early Roman periods (c. 150 -50 B.C.) was the so-called pillar-molded bowl. Here exterior ribs radiate up from the base, stopping abruptly near the rim to allow a smooth margin around the circumference. This type is ubiquitous; and it attests to the free and rapid exchange of ideas in glass-making throughout the Greater Mediterranean sphere. The site of Tel Anafa in Israel is a small settlement in the Upper Galilee. During ten seasons of fieldwork between 1968 and 1986, Saul Weinberg and his successor Sharon Herbert oversaw the uncovering of part of a small settlement of the Hellenistic and early Roman periods.

In Tel Anafa I, Herbert presents the architecture and the stratigraphic sequence (text and some illustrations in fasc. i, locus summary and plates to Chs. 1 and 2 in fasc. ii). The volume also includes studies by other scholars of the geological setting of the site, the stamped amphora handles, coins, vertebrate fauna, and a single Tyrian sealing. Tel Anafa II, i is devoted to the Hellenistic and Roman pottery. A future volume (II, ii) will complete the series with publication of the pre-Hellenistic and Islamic pottery, lamps, glass, metalware, stucco, stone tools, and the palaeobotanical remains. Tel Anafa (recently excavated jointly by the Universities of Michigan and Missouri) has provided critical information on the chronological limits of these bowls within the Roman period. Glass vessels were initially available only to the very wealthy and only in rather diminutive sizes. They were manufactured by core forming, casting, cutting and grinding. The invention of glass blowing around 50 BC brought glass vessels to the general public in vast numbers, mass produced in great variety of forms and hence brought ancient glass into the reach of the modern collector of even modest means. One can nowadays own a Roman glass bowl, or drink from a Roman glass beaker, or wear ancient jewellery where glass was used widely. In 63 BC, the Romans conquered the Syro-Palestine area. They brought back with them glassmakers to Rome.Soon after, the first transparent glass sheets were produced in Rome. The word vitrum, meaning glass, entered the Latin language.Rome's political, military, and economic dominanace in the Mediterranean world was a major factor in attracting skilled craftsmen to set up workshops in the city, but equally important was the fact that the establishment of the Roman industry roughly coincided with the invention of glassblowing. The new technique led craftsmen to create novel and unique shapes; examples exist of flasks and bottles shaped like foot sandals, wine barrels, fruits, and even helmets and animals. Some combined blowing with glass-casting and pottery-molding technologies to create the so-called mold-blowing process. Further innovations and stylistic changes saw the continued use of casting and free-blowing to create a variety of open and closed forms that could then be engraved or facet-cut in any number of patterns and designs.

Core-formed and cast glass vessels were first produced in Egypt and Mesopotamia as early as the fifteenth century B.C., but only began to be imported and, to a lesser extent, made on the Italian peninsula in the mid-first millennium B.C. By the time of the Roman Republic (509-27 B.C.), such vessels, used as tableware or as containers for expensive oils, perfumes, and medicines, were common in Etruria (modern Tuscany) and Magna Graecia (areas of southern Italy including modern Campania, Apulia, Calabria, and Sicily). However, there is very little evidence for similar glass objects in central Italian and Roman contexts until the mid-first century B.C. The reasons for this are unclear, but it suggests that the Roman glass industry sprang from almost nothing and developed to full maturity over a couple of generations during the first half of the first century A.D.

Doubtless Rome's emergence as the dominant political, military, and economic power in the Mediterranean world was a major factor in attracting skilled craftsmen to set up workshops in the city, but equally important was the fact that the establishment of the Roman industry roughly coincided with the invention of glassblowing. This invention revolutionized ancient glass production, putting it on a par with the other major industries, such as that of pottery and metalwares (as 20.49.2-12). Likewise, glassblowing allowed craftsmen to make a much greater variety of shapes than before. Combined with the inherent attractiveness of glass-it is nonporous, translucent (if not transparent), and odorless-this adaptability encouraged people to change their tastes and habits, so that, for example, glass drinking cups rapidly supplanted pottery equivalents.

In fact, the production of certain types of native Italian clay cups, bowls, and beakers declined through the Augustan period, and by the mid-first century A.D. had ceased altogether.However, although blown glass came to dominate Roman glass production, it did not altogether supplant cast glass. Especially in the first half of the first century A.D., much Roman glass was made by casting, and the forms and decoration of early Roman cast vessels demonstrate a strong Hellenistic influence. The Roman glass industry owed a great deal to eastern Mediterranean glassmakers, who first developed the skills and techniques that made glass so popular that it can be found on every archaeological site, not only throughout the Roman empire but also in lands far beyond its frontiers.

Cast Glass

Although the core-formed industry dominated glass manufacture in the Greek world, casting techniques also played an important role in the development of glass in the ninth to fourth centuries B.C. Cast glass was produced in two basic ways-through the lost-wax method and with various open and plunger molds. The most common method used by Roman glassmakers for most of the open-form cups and bowls in the first century B.C. was the Hellenistic technique of sagging glass (81.10.243) over a convex "former" mold. However, various casting and cutting methods were continuously utilized as style and popular preference demanded. The Romans also adopted and adapted various color and design schemes from the Hellenistic glass traditions, applying such designs as network glass and gold-band glass to novel shapes and forms. Distinctly Roman innovations in fabric styles and colors include marbled mosaic glass, short-strip mosaic glass, and the crisp, lathe-cut profiles of a new breed of fine as monochrome and colorless tablewares of the early empire, introduced around 20 A.D. This class of glassware became one of the most prized styles because it closely resembled luxury items such as the highly valued rock crystal objects, Augustan Arretine ceramics (as 10.210.37), and bronze and silver tablewares (as 20.49.2-12) so favored by the aristocratic and prosperous classes of Roman society. In fact, these fine wares were the only glass objects continually formed via casting, even up to the as Late Flavian, Trajanic, and Hadrianic periods (96-138 A.D.), after glassblowing superceded casting as the dominant method of glassware manufacture in the early first century A.D.

Blown Glass

SOMETIME AROUND 70 B.C., in Jerusalem, someone realized that, if you took a glass tube -- then the stock for mass production of beads -- sealed one end and blew into the other, you could create a glass bulb. Blow hard enough and long enough, and you could make a small bottle. This was glassblowing at its most primitive. It is quite possible that, without further refinement, this moment of experimentation might have passed unnoticed. A couple of decades later, however, the introduction of a separate blowpipe, together with a tool-kit of variously-sized pincers and paddles, made it possible to blow and shape glass with much greater control, and with much greater novelty.

The new technology revolutionized the Italian glass industry, stimulating an enormous increase in the range of shapes and designs that glassworkers could produce. A glassworker's creativity was no longer bound by the technical restrictions of the laborious casting process, as blowing allowed for previously unparalleled versatility and speed of manufacture. These advantages spurred a rapid evolution of style and form, and experimentation with the new technique led craftsmen to create novel and unique shapes; examples exist of flasks and bottles shaped like foot sandals, wine barrels, fruits, and even helmets and animals. Some combined blowing with glass-casting and pottery-molding technologies to create the so-called mold-blowing process. Further innovations and stylistic changes saw the continued use of casting and free-blowing to create a variety of open and closed forms that could then be engraved or facet-cut in any number of patterns and designs.

But the potential of a technological idea will only come to fruition if its seed is planted in an encouraging cultural environment. During Rome's Republican Era, in the dictatorial times of Sulla and Julius Caesar, such encouragement seems to have been lacking. In the Hellenistic world, the firmly established traditions of working glass -- either by blending threads of it into closed vessel forms or by slumping glass over a pre-shaped model for open ones -- were producing fine wares with which the infant technique of free-blowing could not yet compete. In the Roman world, however, pottery was still the material of choice for everything domestic, from fish platters to perfume bottles, and no one seemed to be in any hurry to change that situation. Enter the Emperor Augustus. It is said that he had no love of foreigners; he viewed the appreciable numbers of them living in Rome around 10 B.C. as a potential source for the corruption of traditional Roman values. If I interpret his subsequent actions correctly, he wanted the Italian mainland to be far more self-sufficient wherever possible. So it was that Italian businesses in certain crafts -- most obviously, pottery- and cloth-making -- were encouraged to expand. The craft of glassworking now was adopted from the Hellenistic world with much energy and skill. An ancient Industrial Revolution was underway.

To get things moving, the Romans simply enslaved hundreds of skilled craftsmen in the eastern provinces, uprooting them from their homes and resettling them in the outskirts of rapidly-growing Roman cities. Pottery-makers were imported from Asia Minor, particularly from around Pergamum, and put to work at Arretium; Greek craftsmen were moved from Athens to Lyons and other cities in central Gaul; glassworkers were brought in from the provinces of Syria, Judaea, and Aegyptus -- most likely from the cities of Sidon, Jerusalem, and Alexandria -- and put to work in shops at Naples, Aquileia, and just outside Rome itself.

There was an immediate market niche for glassware in Augustan times. Like many ancient peoples, the Romans believed in an afterlife that was an idealized form of their worldly experience. According to its means, the family of each dead Roman was obliged to provide furnishings for the grave. Such furnishings always included regular domestic items -- plates of food, flasks of wine, and so on -- but it was also a tradition to include offerings of perfume. The Roman wealthy would put these offerings in bottles (unguentaria) made of silver or alabaster. The eastern craftsmen who brought with them the skill of glassblowing now offered the rest of the population an alternative in glass; to be sure, not something as elegant or colorful as might have been wished, but which everyone could afford. The free-blown unguentarium was one of the immediate and long-term successes of the newly emerging industry. Modern excavations have revealed many instances where a grave contains not just one or two but a couple of dozen of these, all mass-produced, each in a matter of minutes at most.

At the same time, glass captured the popular imagination by virtue of its translucency. You could see the color of wine in a beaker, or how well a bottle was filled even if it was sealed -- which could not be said for items made of pottery, or indeed of bronze, silver, or gold. The production of wine glasses soared in the Augustan era, actually causing the demise of some of the pottery workshops that specialized in traditional beaker types. It was glass's distinctive property of transparency that stimulated the Emperor Nero's tutor, Lucius Seneca to observe that " ... Apples seem more beautiful if they are floating in a glass." (Investigations in Natural Science I.6). And, from the middle of the first century A.D. onward, squared-sided glass bottles -- typically with capacities in the half- to one-liter range -- were used for a great deal of the short-range movement of liquids such as olive oil and the popular fish sauce known as garum. Thus the industrialization of glassworking in the Augustan era came about through the influence of three distinct forces: First, by virtue of certain historical events (Augustus's rise to power and his promotion of craft-centralization on the Italian mainland); second, because of a technical innovation (the invention of glassblowing in one of Rome's eastern provinces); and third, the social pressure related to fashion or taste (a traditional link between perfumery and Roman funerary ritual). Change in the Roman glassworking industry was always most dramatic whenever all three of these forces came together at one time.

Uses

At the height of its popularity and usefulness in Rome, glass was present in nearly every aspect of daily life-from a lady's morning toilette to a merchant's afternoon business dealings to the evening cena, or dinner. Glass alabastra , unguentaria, and other small bottles and boxes held the various oils, perfumes, and cosmetics used by nearly every member of Roman society. Pyxides often contained jewelry with glass elements such as beads, cameos, and intaglios , made to imitate semi-precious stone like carnelian, emerald, rock crystal, sapphire, garnet, sardonyx, and amethyst.

Merchants and traders routinely packed, shipped, and sold all manner of foodstuffs and other goods across the Mediterranean in glass bottles and jars of all shapes and sizes, supplying Rome with a great variety of exotic materials from far-off parts of the empire. Other applications of glass included multicolored tesserae used in elaborate floor and wall mosaics, and mirrors containing colorless glass with wax, plaster, or metal backing that provided a reflective surface. Glass windowpanes were first made in the early imperial period, and used most prominently in the public baths to prevent drafts. Because window glass in Rome was intended to provide insulation and security, rather than illumination or as a way of viewing the world outside, little, if any, attention was paid to making it perfectly transparent or of even thickness. Window glass could be either cast or blown. Cast panes were poured and rolled over flat, usually wooden molds laden with a layer of sand, and then ground or polished on one side. Blown panes were created by cutting and flattening a long cylinder of blown glass. AN INDUSTRY THOUGH Roman glassworking certainly was, it was one that maintained a remarkable degree of dynamism over the centuries. The shape and decoration of two of its main products -- the unguentarium and the wine beaker -- were being modified every few decades, sometimes quite sharply, and there were many new items of glassware introduced that expanded the glassworker's repertoire in significant ways. The way that the Romans committed themselves so heavily to the maintenance of good ports all around the Mediterranean coastline and of fine roads that criss-crossed the entire Empire on land was also critical for keeping the Roman glassmaking industry so dynamic. Of course, the main purpose of such maintenance was to assure the easy movement of troops from one trouble spot to another, and of administrative information from one city to another. But these ports and roads also allowed the movement of people and their ideas. Signatures and inscriptions in Greek indicate clearly enough that eastern Mediterranean craftsmen settled at various places in northern Italy and central Gaul; that north African and Syrian soldiers were conscripted to serve in the army in northern England, thereafter to settle there as tradesmen; and that businessmen of every background and philosophical persuasion traded wherever it was to their advantage to do so. Thus, every Roman city became a social melting-pot where technical innovations could be passed on, blending with or displacing old ideas, sometimes in the space of just a decade or two. The industrial activities of the Roman world responded accordingly, with a freshness of purpose and an ongoing rise in skill.

Jewelry in the Roman Times

Ancient Roman glass jewelry reached its height during the Augustan age, at the beginning of the Empire. This meant that in many ways the glass jewelry were deprived of much of the expressive freedom one might expect and hope for. The buyers of this fine artistic jewelry were the conservative political. The period of peace achieved during the rule of Augustus and Augustus made this possible, especially after the vicious fighting of the Roman civil wars. Ancient Roman jewelry in earlier times was derived from both Hellenistic and Etruscan jewelry. In addition, as Roman jewelry designs freed itself of Hellenistic and Etruscan influences, greater use was made of colored stones such as: topazes, emeralds, rubies, sapphires, and pearls. Trojan and Cretan artisans of the Minoan period, although working at opposite ends of the Aegean region, crafted earrings, bracelets, and necklaces of a common type that persisted from about 2500 BC to the beginning of the Classical period of Greek art 479 BC - 323 BC.

Roman jewelry was highly influenced by some of the designs of the places they conquered and established connections with. The creators spared no effort in making some of the most exquisite and ornamental compositions. Rings were a major symbol in the body of ancient Roman jewelry. Ornamental Roman jewelry was worn by women of high status. They often wore jewelry on their ears, neck, arms and hands. Ancient Roman designs and fashion jewelry also included seal rings, amulets and talismans. The cameo and hoop earrings were introduced in ancient Roman times. Ancient Roman glass jewelry reached its height during the Augustan age, at the beginning of the Empire. This meant that in many ways the glass jewelry were deprived of much of the expressive freedom one might expect and hope for. The buyers of this fine artistic jewelry were the conservative political. The period of peace achieved during the rule of Augustus and Augustus made this possible, especially after the vicious fighting of the Roman civil wars.

The gold beads of ancient Rome were artfully shaped to create images of flowers and animals. The most common fact that is assumed by most is that the ancient Roman jewelry has a similar resembles to the Greek and Etruscan jewelry.




More about Israeli handmade Roman glass jewelry at http://www.bluenoemi-jewelry.com/isroglsije.html



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Friday, July 8, 2011

Cut Glass and Glass Blowing History and Development


Natural glass, like obsidian, is a dense volcanic glass, and has been used by man for millennia. To early man, obsidian glass was an extremely rare and valuable commodity, Because of the way volcanic glass fractures, sharp edges occur. This inherent quality of natural cut glass was put to use and was often made into sharp spear points and blades.

Man-made rudimentary glass was made from silica sand, plant ash and lime. Over time it was discovered that if glass was heated until it became semi-liquid, it may be molded or shaped and left to cool into a solid new piece or vessel. In ancient times glass pieces were valued as a substitute for precious stones or gems.

During first century BC, the craft of melting and blowing glass into useable objects was developed. Glass pieces and items gradually became more common after the discovery of glassblowing. Objects such as vases, bottles, and cruets were mouth blown and mold blown during the Roman Empire, usually for ordinary purpose and daily use.

Common glass normally has a greenish hue. The green tint is caused by miniscule amounts of iron impurities in the sand used to make glass. Glass producers learned to make decorative and colored glass by adding metallic compounds and mineral oxides such as cobalt. Colored glass of reds, blues and greens became prevalent. After craftsmen learned to score and cut glass, they found clear glass refracted light in spectacular fashion. Thus, clear cut glass became popular, and demand for colored glass plummeted.

Around 1000 AD, a new development was made in glassmaking. The glass making component of soda-lime, was replaced by potash obtained from wood ashes. From this time on, glass from the northern part of Europe differed greatly from that made in the Mediterranean area, where soda-lime remained in common use. Centuries later in Bohemia, ashes from beech trees were used. The production of Bohemian "forest glass" was progressively refined over the years.

During the 11th century new ways of making sheet glass came about in Germany. Glass blowers would blow spheres, and then form them into cylinders. They would cut the glass while still hot and then flatten the glass into sheets. Glass makers in Venice, Italy improved this method in 13th century. By the late 1300's there was as many as 20 glassworks in Bohemia and Moravia. The 12th century saw the arrival of stained glass production. Stained glass, another form of colored glass, was made by adding metal impurities. Church and monastery applications of stained glass can be traced back to examples that remain today, i.e. St. Bartholomew church in Kolin. A glass wall mosaic is preserved there from around 1380.

Venice became the dominant center for glassmaking during the 14th century. Here new glass making methods were developed and export trade such as mirrors, tableware, and decanters flourished. Secrets of glass making were highly guarded in Venice, but eventually glass workers moved to other areas of Europe taking their knowledge and skill with them.

A technique called "the Crown glass process" was used to make glass until the mid part of the 1800s. A glassblower would spin around 9 lbs of molten glass at the end of a rod until it spread out into a flat disk nearly 5 feet across. The glass disk would then be cut into panes. Glass from Venice was highly prized for over four centuries as they managed to keep this technique secret. In 1688, a method for casting glass was invented. This led to glass and glass panes in becoming a much more common material. The glass pressing machine was invented in 1827 and facilitated mass production of relatively inexpensive glass items. The glass pioneer, William J. Blenko, is recognized as first glass producer in America to use the cylinder method of creating flat glass by the 1920s.

The Bohemian countries of Czech and Slovakia are still known today as two of the finest cut glass and cut crystal producers in the world.




James Zeller writes for numerous glass gift related blogs and websites. Here is a selection of elegant cut crystal that he found and a unique & creative collection of hand blown glass.



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